This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 8 |
| 5 | 36 |
| 6 | 142 |
| 7 | 750 |
| 8 | 4604 |
| 9 | 32876 |
| 10 | 266966 |
| 11 | 2431614 |
| 12 | 24554188 |
| 13 | 272289636 |
| 14 | 3289836254 |
| 15 | 43017800318 |
| 16 | 605289111692 |
| 17 | 9119314568460 |
| 18 | 146474344313974 |
| 19 | 2498617856687406 |